Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12081#issuecomment-208480532
If users did not specify the location, it will have such a directory
`databaseName.db`. For example,
```
hive> show conf "hive.metastore.warehouse.dir";
OK
/user/hive/warehouse STRING location of default database for the
warehouse
hive> create database db2;
OK
Time taken: 0.191 seconds
hive> describe database extended db2;
OK
db2 hdfs://e391721442fb:9000/user/hive/warehouse/db2.db root
USER
hive> describe database extended default;
OK
default Default Hive database
hdfs://e391721442fb:9000/user/hive/warehouse public ROLE
Time taken: 0.013 seconds, Fetched: 1 row(s)
```
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